JavaScript控制圖片載入完成後呼叫回呼函數的方法_javascript技巧

本文實例講述了JavaScript控制圖片載入完成後呼叫回調函數的方法。分享給大家供大家參考。具體分析如下：

這段程式碼可以控制指定區域內的圖片載入完成後執行指定的回呼函數。

複製程式碼 程式碼如下:

function when_images_loaded($img_container, callback) {
/* do callback when images in $img_container (jQuery object) are loaded. Only works when ALL images in $img_container are newly inserted images and this function is called imtely are newly inserted images and this function is called imtely areafter mediately aret.     var _imgs = $img_container.find('img'),
        img_length = _imgs.length,
        img_load_cntr = 0;
    if (img_length) {//if the $img_container contains new images.
        _imgs.on('load', function() {//then we avoid the callback until images are loaded
            img_load_cntr ;
            if (img_load_cntr == img_length) {
               則為 callback();
            }
        });
    }
    else { //otherwise just do the main callback action if there's no images in $img_container.
        callback();
    }
}

希望本文所述對大家的javascript程式設計有所幫助。